Blew the 400 up

[L31MaxExpress]

Are the heads 062s or 906s? Do they have Canada or Mexico cast into them? As long as they check out ok without cracks the Canadian heads especially 906s flow alot better than the Mexican 062s do.

 

[Supercharged111]

Are the heads 062s or 906s? Do they have Canada or Mexico cast into them? As long as they check out ok without cracks the Canadian heads especially 906s flow alot better than the Mexican 062s do.

This is after cutting the valve seats on the 906, correct?

 

[L31MaxExpress]

This is after cutting the valve seats on the 906, correct?

That was with stock seats. Peak flow is largely the same either way. You get more low-mid lift with the back cut.

 

[Deadman walking]

Are the heads 062s or 906s? Do they have Canada or Mexico cast into them? As long as they check out ok without cracks the Canadian heads especially 906s flow alot better than the Mexican 062s do.

It's a mexico made block with Mexico 906 heads. Now the 400 is a Canadian block. I have a question about this. Will the summit k1103 cam survive the valve springs? I mean since roller has more seat pressure.

 

[Hipster]

It's a mexico made block with Mexico 906 heads. Now the 400 is a Canadian block. I have a question about this. Will the summit k1103 cam survive the valve springs? I mean since roller has more seat pressure.

Huh? Going to ditch the roller cam set-up to install a flat tappet?

 

[Deadman walking]

Huh? Going to ditch the roller cam set-up to install a flat tappet?

Yeah pretty much

 

[L31MaxExpress]

It's a mexico made block with Mexico 906 heads. Now the 400 is a Canadian block. I have a question about this. Will the summit k1103 cam survive the valve springs? I mean since roller has more seat pressure.

The Vortec springs have very light spring pressure. I can open the valves with my bare hand on one. Like 80# at the seat and a weak 256 lb/in rate. The uber basic aftermarket "Z/28" spring is 90-110 # at the seat and around 320-340 lb/in depending on who you talk with.

 

[Deadman walking]

Huh? Going to ditch the roller cam set-up to install a flat tappet?

Now that I know that motor is a 4 bolt main. With that low of miles. It's gonna yanked eventually and machined to a blown 383 and thrown in my 73 Camaro.

 

[Deadman walking]

Got the intake today still waiting on the adapter and seal and I'll be ready to throw her on the run stand

 

[Deadman walking]

Well I've been busy but got. The TBI on the intake. At least the throttle blades don't hit the adapter anymore.