Ford 302 / 5.0 Windsor Head Bolt Torque & Tightening Sequence (1968-2001)
By WhatSizeBoltEdited 13 min read8 source links
The factory 302 head bolt spec split in two: reusable hex bolts through 1989-92 (Intake side 80, Exhaust side 68 ft-lb), then torque-to-yield flanged bolts after (25-35, then 45-55 ft-lb, then a 1/4 turn). The 351W uses larger 1/2" bolts at 85/95/105-112 ft-lb -- a different spec, not a scaled-up 302 number.
Look up "Ford 302 head bolt torque" and you will find one number confidently repeated for every year from 1968 to 2001 — and it is wrong for most of them. Ford changed the bolt and the procedure at least twice over the small-block Windsor’s run, and the 351W was never on the same spec as the 302 to begin with: it uses a physically larger bolt. Get the era wrong and you either leave clamp load on the table or stretch a bolt Ford never designed to be reused.
What this article covers
289, 302 and 351 Windsor — not the 351 Cleveland.
This covers the small-block Ford V8 family built at the Windsor, Ontario plant: the 289 (1963–68), 302/5.0L (1968–2001, factory and Ford Performance crate versions) and 351 Windsor/5.8L (1969–1997). It does not cover the unrelated 351 Cleveland or 351M/400 — different head, different bolt pattern — though Fel-Pro’s own chart happens to spec the 351C at the same 95–105 lb-ft as some 351W years, which is a coincidence of the number, not a shared engine family. Mustang, F-150, Bronco and Fox-body applications all sit under the same block family; check Mustang year pages for the year you have.
Ford 302 (5.0L) head bolt torque specs
One bolt pattern, two very different fasteners depending on the year.
| Era | Bolt type | Thread | Procedure |
|---|---|---|---|
| 1968–1989ish, exc. Boss | Reusable hex-head, Grade 8 | 7/16-14 | Intake side 80 lb-ft, Exhaust side 68 lb-ft — not one number |
| 1969–1971 Boss 302 | Reusable hex-head, Grade 8 | 7/16-14 | Upper bolts 80 lb-ft; Lower bolts 70 lb-ft |
| ~1989–1992 through 2001 | Torque-to-yield, flanged hex — new bolts required | 7/16-14 | 1st 25–35 lb-ft → 2nd 45–55 lb-ft → 3rd +1/4 turn (85–95°) |
| Ford Performance crate heads (M-6049-X2), early reusable option | Reusable Grade 8 w/ ARP bushings | 7/16-14 | 1st 50 lb-ft → 2nd 70 lb-ft (2 steps, Loctite 567/565 on the threads) |
| Ford Performance crate heads (M-6049-X2), TTY option | Torque-to-yield | 7/16-14 | 1st 35 lb-ft → 2nd 55 lb-ft → 3rd +1/4 turn (90°) |
351 Windsor — a different bolt, a different spec
Do not reuse a 302 number here. The bolt itself is a different size.
| Era | Thread | Procedure |
|---|---|---|
| 1969–1972 | 1/2-13 | 95–100 lb-ft, single step |
| 1973–1998 | 1/2-13 | 1st 85 lb-ft → 2nd 95 lb-ft → 3rd 105–112 lb-ft |
| Ford Performance crate heads (M-6049-X2), performance block | 1/2-13 | 1st 55 lb-ft → 2nd 100 lb-ft |
The 351W head bolt is 1/2-13 versus the 302’s 7/16-14 — a bigger fastener carrying more clamp load over a larger deck, which is exactly why the torque numbers run 20–40 lb-ft higher across every era. ARP’s own kit instructions for the two engines list different bolt diameters for exactly this reason (see the ARP table further down). If a chart quotes one number for “302/351W” as if they share a spec, that chart has already blended two different bolts.
Tightening pattern
Ten bolts per head, worked from the centre outward.
Run the entire pattern at each pass — every bolt to the first step before any bolt sees the second, and the same order again for the final step or angle turn. Ford’s own service manual instruction is explicit on this: “Tighten cylinder head bolts a little at a time in steps in the sequence shown in the illustrations.” Never run one bolt all the way to final torque and move on — that pulls one corner of the head down against a gasket the rest of the head hasn’t touched yet.
How to torque 302/351W head bolts, step by step
The water-jacket detail is the one people skip — and it is the one that leaks.
- Clean and chase the block threads — debris in a blind hole absorbs torque that never reaches the clamp load.
- Check where each bolt hole leads. On the Windsor small-block, some head bolt holes run into the water jacket rather than staying blind. ARP’s own kit instructions and Fel-Pro’s installation guide say the same thing: wherever a bolt protrudes into a water jacket, coat its threads with a non-hardening thread sealer (ARP Thread Sealer, or Loctite 567/565 per Ford Performance) instead of assembly lube — skip this and the bolt hole weeps coolant into the lifter valley.
- Lightly oil or lube the remaining threads per the procedure for your bolts — light oil for factory bolts, ARP Ultra-Torque assembly lubricant (not motor oil) for an ARP kit.
- Fit the head gasket. Fel-Pro PermaTorque gaskets need no supplemental sealer; embossed steel-shim, copper-faced or steel-faced gaskets should get a non-hardening gasket sealer as backup.
- Run the full 10-bolt pattern to the first step — the value from the tables above for your era and engine.
- Run the full pattern again to the second step for your procedure.
- Finish with the third step or the angle turn — fit a torque angle gauge for any procedure that calls for a partial turn in degrees rather than a third torque figure; counting flats on the socket is not accurate enough on a bolt being stretched past yield.
- Use a calibrated torque wrench throughout, not an impact gun, and re-check the pattern once the engine has reached operating temperature if your gasket calls for a hot retorque (PermaTorque gaskets do not).
Torque-to-yield: reuse or replace?
The factory switched partway through the 302’s run — know which bolt is in your hand.
The early reusable hex-head bolts (Intake 80 / Exhaust 68, or the Boss 302’s Upper 80 / Lower 70) are conventional fasteners and can be reused if they are clean, straight and undamaged. The later flanged torque-to-yield bolts are a different design: Ford’s own service manual labels that procedure “Flanged Hex Head Bolt (new bolts required)” in the torque spec table itself — it is not a suggestion. Fel-Pro’s technical guidance is blunt about why: a TTY bolt is tightened into its yield zone, and “if these bolts are removed and reused, it is likely that either the head gasket will fail due to false torque readings or that the bolts may break… we recommend never reusing a T-T-Y head bolt.”
ARP replacement values
Aftermarket kits are not TTY — and they run their own numbers, not the factory spec.
| ARP kit | Application | Thread | Torque |
|---|---|---|---|
| 154-3601 (hex head bolt kit) | 289/302 | 7/16" (180,000 PSI) | 70 lb-ft in 3 equal steps, ARP Ultra-Torque lube |
| 154-4001 (head stud kit) | 289/302 | 7/16" (200,000 PSI) | 80 lb-ft in 3 equal steps, ARP Ultra-Torque lube |
| 154-3603 (hex head bolt kit) | 351W | 1/2" (180,000 PSI) | 100 lb-ft in 3 equal steps, ARP Ultra-Torque lube |
ARP bolts and studs are conventional, reusable fasteners — not torque-to-yield — which is part of why racers replace the factory TTY bolts with them in the first place. All three kits carry the identical instruction on the water-jacket question: “If the cylinder head bolts protrude into a water jacket, lubricate the threads of the bolts with ARP THREAD SEALER”, and use the supplied Ultra-Torque assembly lubricant everywhere else — ARP is explicit that motor oil gives inconsistent clamping force compared to their lube. Follow the instruction sheet in your specific kit box; part numbers and torque values change when ARP updates a kit.
Gasket-specific notes (Fel-Pro Permatorque)
The gasket you run changes two things: the sealer, and whether you retorque.
- No supplemental sealer on PermaTorque. Fel-Pro’s own guidance: “Sealers are NOT required on FEL-PRO PermaTorque head gaskets. However, embossed steel shim, copper-faced, or steel-faced gaskets should be coated with a non-hardening automotive gasket sealer as a supplemental seal.”
- No hot retorque on PermaTorque. “Remember that FEL-PRO PermaTorque designs do NOT require retorquing.” Older retorque-style gaskets still need it — 300 to 500 miles after install, warm, in the same numbered sequence.
- Keep bolts in their original position. Fel-Pro flags this specifically for engines where bolt length varies by hole: “Head bolts on some engines may vary in length and size, and it is important that they be replaced in their original location.” Lay them out in order as they come out.
- The water-jacket sealant rule applies regardless of gasket brand — it protects the bolt hole itself, not the head-to-block joint the gasket seals.
Related torque values
The other fasteners you disturb getting to the head, from the same factory table.
| Fastener | Torque |
|---|---|
| Exhaust manifold to cylinder head bolt | 24-32 lb-ft |
| Rocker arm fulcrum bolt to cylinder head | 24-34 lb-ft |
| Rocker arm bolt (Ford Performance bolt-down rockers) | 18-22 lb-ft |
| Valve cover bolt (Ford Performance) | 9 lb-ft |
Confirm these against the manual for your specific year and application — the bolt-down rocker and valve cover figures come from the Ford Performance crate-head instruction sheet, not the stock stud-mounted rocker arm factory spec.
Tools and parts for the job
The angle gauge matters most on the TTY bolts — order anything you are missing before you start.
Some links below are Amazon affiliate links — as an Amazon Associate we may earn a small commission at no extra cost to you.
Torque angle gauge
The flanged TTY 302 spec, and the Ford Performance TTY option for both engines, end in a partial turn measured in degrees, not a torque figure. A 1/2" drive angle gauge is the only accurate way to hit that turn.
1/2" torque wrench
Every procedure on this page is staged — two or three passes building to the final number. A calibrated click wrench is what makes each stage mean something.
Ford 302/351W head bolt set
Confirm 7/16" for a 302 or 1/2" for a 351W before you order — and if your engine uses the later flanged TTY bolts, a fresh set is not optional.
Fel-Pro PermaTorque head gasket set, 302/351W
Match the set to your specific engine and year — the 302 and 351W use different gaskets, and PermaTorque needs no sealer and no hot retorque.
Common mistakes
Six ways a Windsor head job comes back.
- Using one torque number for the whole 302 run — the reusable-bolt era and the TTY era are different procedures, not the same number rounded differently.
- Carrying a 302 spec onto a 351W — the 351W bolt is 1/2", not 7/16", and its torque runs 20–40 lb-ft higher.
- Skipping the water-jacket thread sealant — the one Windsor detail that ARP, Fel-Pro and Ford Performance all call out separately from the general torque procedure.
- Reusing flanged TTY bolts — Ford’s own manual says new bolts required; there is no way to tell a used one from a new one by looking at it.
- Averaging the early split-torque spec — Intake side and Exhaust side (or Upper and Lower on a Boss 302) are two different numbers, not one number split in error.
- Skipping the angle gauge — counting hex flats is not accurate enough for a 1/4-turn spec on a bolt already near its yield point.
Frequently asked questions
What is the head bolt torque on a Ford 302?
It depends on the era. Earlier reusable hex-head bolts (roughly 1968 through the late 1980s) go to Intake side 80 lb-ft, Exhaust side 68 lb-ft — two different numbers, not one. Later torque-to-yield flanged bolts (into the 1990s and through 2001) go 1st 25-35 lb-ft, 2nd 45-55 lb-ft, then an additional 1/4 turn (85-95 degrees), and Ford specifies new bolts for that procedure.
Is the 351 Windsor head bolt torque the same as the 302?
No. The 351W uses a larger 1/2" bolt versus the 302's 7/16", and its own torque procedure: 1st 85 lb-ft, 2nd 95 lb-ft, 3rd 105-112 lb-ft for the 1973-1998 span, or 95-100 lb-ft single-step for 1969-1972. Never reuse a 302 figure on a 351W.
What is the head bolt tightening sequence on a small-block Ford?
Ten bolts per head, worked from the centre pair outward in the numbered order shown in Ford/Motorcraft service literature. The same order is used whether the bolts are reusable or torque-to-yield — only the torque value changes.
Can I reuse Ford 302 head bolts?
Only if they are the earlier reusable hex-head design, and only if they are clean, straight and undamaged. The later flanged torque-to-yield bolts are single-use — Ford's own service manual labels that procedure "new bolts required," and there is no visual way to tell a stretched TTY bolt from a new one.
Do Ford 302/351W head bolts need thread sealant?
Wherever a bolt hole runs into the water jacket rather than staying blind, yes. ARP's kit instructions and Fel-Pro's installation guidance both call for a non-hardening thread sealer on those bolts specifically — Ford Performance's own instruction sheet specifies Loctite 567 or 565 for the same reason. Everywhere else, use the lubricant your procedure specifies instead.
Keep going
Bottom line: run the same 10-bolt centre-out pattern on any 289/302/351W Windsor head, but match the torque to the actual bolt in your hand: reusable hex bolts split Intake/Exhaust (or Upper/Lower on a Boss 302), later flanged TTY 302 bolts go 25-35, then 45-55 lb-ft, then a 1/4 turn with new bolts every time, and the 351W runs its own larger-bolt spec at 85, then 95, then 105-112 lb-ft. Thread sealant on any bolt that reaches a water jacket, PermaTorque needs no supplemental sealer or hot retorque, and an ARP kit is a different fastener with its own number — not a shortcut to the factory spec.
Sources
- ARP instruction sheet 154-3601 — 289/302 hex head bolt kit, 7/16", 70 lb-ft in 3 equal steps, water-jacket thread sealer note.
- ARP instruction sheet 154-4001 — 289/302 head stud kit, 7/16", 80 lb-ft in 3 equal steps.
- ARP instruction sheet 154-3603 — 351W hex head bolt kit, 1/2", 100 lb-ft in 3 equal steps.
- Ford Performance instruction sheet M-6049-X2 — official Ford Motor Company assembly notes for the aluminum SB 302/351 cylinder head, all three bolt/block torque procedures plus related fastener torques.
- 1987 Mustang 5.0L HO factory service manual, Head Torque Sequence (reproduced by Operation CHARM) — the numbered 10-bolt diagram.
- 1993 Mustang 5.0L HO/5.8L factory service manual, Torque Specifications (reproduced by Operation CHARM) — the 302 2-step and 351W 3-step torque tables.
- 1994 Mustang 5.0L Cobra factory service manual, Torque Specifications (reproduced by Operation CHARM) — the flanged TTY bolt footnote, new bolts required.
- Fel-Pro Torque Tables catalog (Federal-Mogul, 2009) — the FORD PRODUCTS V8 torque table and the PermaTorque/T-T-Y installation guidance quoted above.