Vortec Cylinder Heads: The Definitive Guide

[sandlapper]

that 4.25 speedmaster like 4.25 pro products 52007 are probably lowest QUADRAJET aka Spreadbore flange vortec intakes.
A few others are a little lower but they're for Squarebore carbs on vortec

 

[Francesco]

that 4.25 speedmaster like 4.25 pro products 52007 are probably lowest QUADRAJET aka Spreadbore flange vortec intakes.
A few others are a little lower but they're for Squarebore carbs on vortec

Hi! The speedmaster i found is adapted for square and spread bore. Do you have a part number for the lower ones? Which ones are close to the performer 2101? Any brands? Thanks mister!

 

[Chevyforever]

Yup ...

I thought we were talking CDN dollars.

 

[Francesco]

I thought we were talking CDN dollars.

No lol. I thought you were american. Anyhow, the heads are like new and they come with everything except the intake.

 

[sandlapper]

Hi! The speedmaster i found is adapted for square and spread bore. Do you have a part number for the lower ones? Which ones are close to the performer 2101? Any brands? Thanks mister!

JMO, too often some adapter plates literally suck; leak & suck air.

Which carb will YOU use? Square-bore or Spread-bore ?

Weiand Square-bore street warrior 8121
--- flange Front 3.375" + flange Rear 4.500" / 2 = Average = 3.938"
https://www.holley.com/products/intakes/dual_plane_manifolds/parts/8121
https://documents.holley.com/199r10370rev3.pdf

 

[Francesco]

JMO, too often some adapter plates literally suck; leak & suck air.

Which carb will YOU use? Square-bore or Spread-bore ?

Weiand Square-bore street warrior 8121
--- flange Front 3.375" + flange Rear 4.500" / 2 = Average = 3.938"
https://www.holley.com/products/intakes/dual_plane_manifolds/parts/8121
https://documents.holley.com/199r10370rev3.pdf

Hi again! Im using a holley street avenger 770 cfm square bore. Wow! thanks! Thats a pretty low rise intake!

 

[sandlapper]

No lol. I thought you were american. Anyhow, the heads are like new and they come with everything except the intake.

Vortecs are great but seem to be more prone to cracking than others. Unless you're an expert, suggest have a pro shop inspect & test for cracks. Even a trained naked eye cannot detect some smaller cracks; small cracks usually grow. G'Luck.

 

[Francesco]

Vortecs are great but seem to be more prone to cracking than others. Unless you're an expert, suggest have a pro shop inspect & test for cracks. Even a trained naked eye cannot detect some smaller cracks; small cracks usually grow. G'Luck.

I trust my mechanic but i will get them checked at a speed shop. Thanks pal!

 

[sandlapper]

Do yourself a favor; do Not use Vortec intake gaskets with a composite / polymer carrier. That's what caused so many intake gasket failures in OE Vortec motors. Instead, suggest use a gasket that has a metal carrier such as Mahle MS 20136
https://www.rockauto.com/en/moreinfo.php?pk=9094092&cc=1352955&jsn=10729&jsn=10729
https://www.rockauto.com/en/parts/mahle,MS20136,intake+manifold+gasket,5424
https://www.summitracing.com/parts/mah-ms20136/applications

 

[Francesco]

Do yourself a favor; do Not use Vortec intake gaskets with a composite / polymer carrier. That's what caused so many intake gasket failures in OE Vortec motors. Instead, suggest use a gasket that has a metal carrier such as Mahle MS 20136
https://www.rockauto.com/en/moreinfo.php?pk=9094092&cc=1352955&jsn=10729&jsn=10729
https://www.rockauto.com/en/parts/mahle,MS20136,intake+manifold+gasket,5424
https://www.summitracing.com/parts/mah-ms20136/applications

So this is what you recommend? Ill order it then. Thank you!