Re: Patriot heads SBC
I ran a set of these Patriots on a 383 in my truck and didn't have any problems (other then not having enough gear for the cam and victor jr I had on the engine). The flow numbers were good too for a cast head. If I had to complain it'd be that they're machined for both centerbolt and perimiter valvecovers and it was hard to get my perimiter's to seal. I'd have run centerbolts but I already had wide body rockers. Something to think about if you don't have the rockers yet.
FWIW, the Summit heads are all cast/machined/assembled in the US.
antmnte, I'm not sure the 406 would have bad angles for a street motor. Lots of 3.75" stroke motors running around out there with no problems. I think a lot of the "wives tales" come from assuming that racing failures will happen at street RPM. By that logic, stock 5.0 mustangs would have all exploded on the drive home from the dealership because of their thin castings. Consider that the 400 had a shorter rod from the factory even though it will take a 5.7 or 6" rod and the 400's were obviously severe duty engines in 3/4 ton trucks and fullsize chevs. The only guys I've ever seen de-stroke a 400 on a regular basis are circle track guys and yeah, a 3.75 stroke is probably too long for extended periods of 8000 rpm with factory castings.
I ran a set of these Patriots on a 383 in my truck and didn't have any problems (other then not having enough gear for the cam and victor jr I had on the engine). The flow numbers were good too for a cast head. If I had to complain it'd be that they're machined for both centerbolt and perimiter valvecovers and it was hard to get my perimiter's to seal. I'd have run centerbolts but I already had wide body rockers. Something to think about if you don't have the rockers yet.
FWIW, the Summit heads are all cast/machined/assembled in the US.
antmnte, I'm not sure the 406 would have bad angles for a street motor. Lots of 3.75" stroke motors running around out there with no problems. I think a lot of the "wives tales" come from assuming that racing failures will happen at street RPM. By that logic, stock 5.0 mustangs would have all exploded on the drive home from the dealership because of their thin castings. Consider that the 400 had a shorter rod from the factory even though it will take a 5.7 or 6" rod and the 400's were obviously severe duty engines in 3/4 ton trucks and fullsize chevs. The only guys I've ever seen de-stroke a 400 on a regular basis are circle track guys and yeah, a 3.75 stroke is probably too long for extended periods of 8000 rpm with factory castings.
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