Porting EFI Heads
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Joined: Jan 2004
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Porting EFI Heads
Hi guys;
I in the process of building a EFI 514 stroker; for that I know I need to port my 1990 EFI Heads; I'm using this engine in my truck basically for offroading and some daily driving.
Emissions are not a concern; I have also purchase a comp cam extreme 4x4 and roller rockers
which are your recomendations for porting, which should be the ideal values for Int. port vol? Exh. port vol? Chamber vol?
Thank you
Matias
I in the process of building a EFI 514 stroker; for that I know I need to port my 1990 EFI Heads; I'm using this engine in my truck basically for offroading and some daily driving.
Emissions are not a concern; I have also purchase a comp cam extreme 4x4 and roller rockers
which are your recomendations for porting, which should be the ideal values for Int. port vol? Exh. port vol? Chamber vol?
Thank you
Matias
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Joined: May 2002
Posts: 61
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From: okc
I have ported the e7te heads and they are different from the earlier heads in many ways .
most important to you is they are thin walled in the upper bowl and the left port wall (looking in from the ex. port) upstream of the head bolt.After I ruined a head I had alot of time and money invested in, I made a thickness checking tool from a cheap machinist caliper to gauge my work.
flowed 304@.600lift 2.19" in. valve-200@.600 lift 1.76 ex. valve
most important to you is they are thin walled in the upper bowl and the left port wall (looking in from the ex. port) upstream of the head bolt.After I ruined a head I had alot of time and money invested in, I made a thickness checking tool from a cheap machinist caliper to gauge my work.
flowed 304@.600lift 2.19" in. valve-200@.600 lift 1.76 ex. valve
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