All this work you are describing on the E7s will cost you near $1000 bucks unless you have a buddy in the business. Get budget aftermarket, bolt em on and go. E7s are doorstops.
OK, so from my understanding a warmed over set of milled E7's will be best for my application.Keep the intake valve small -for velocity and throttle response- and increase the exhaust slightly for better scavenging?
So I'm thinking i might attempt a basic port and polish of a set of E7's, I'm sure i can find some from the local pick-n-pull. I understand the chamber is 62cc is this correct? And is it .006" per 1cc when milling? And anything over .020 would require the manifold to be milled as well?
Gasket match intake/exhaust ports and intake manifold.
Blend intake walls, finishing with 80 grit to retain some texture.
Remove thermactor hump and blend and polish exhaust walls, is it worth increasing valve to 1.55 from the stock 1.45?
Polish combustion chambers.
Will be referencing the standard abrasives article and diyporting.com
And GT40's are not good because of the 1.7 rocker ratio, right? Or can they be used with 1.6 rocker arms?
Thanks.
OK, so from my understanding a warmed over set of milled E7's will be best for my application.Keep the intake valve small -for velocity and throttle response- and increase the exhaust slightly for better scavenging?
So I'm thinking i might attempt a basic port and polish of a set of E7's, I'm sure i can find some from the local pick-n-pull. I understand the chamber is 62cc is this correct? And is it .006" per 1cc when milling? And anything over .020 would require the manifold to be milled as well?
Gasket match intake/exhaust ports and intake manifold.
Blend intake walls, finishing with 80 grit to retain some texture.
Remove thermactor hump and blend and polish exhaust walls, is it worth increasing valve to 1.55 from the stock 1.45?
Polish combustion chambers.
Will be referencing the standard abrasives article and diyporting.com
And GT40's are not good because of the 1.7 rocker ratio, right? Or can they be used with 1.6 rocker arms?
Thanks.
good set of aftermarket heads like the world products windsor jr heads
dont go too big on the heads with a mild 289. you want something that will give you good port velocity, and still allow for good breathing at the higher rpm ranges. a good head for your engine is going to be something like the world products windsor jr heads. they have better ports than stock, and have 1.94in/1.60ex valves. if you want an aluminum head then the edelbrock performer rpm heads, or the afr185 heads are also good on your combination. too big a port or valve and the engine will fall on it face.
Another thing about E7s, regardless of your opinion of them: They have no resale value.
If you spend a grand on em, it's down a hole. I put some Performers RPMs on my car, knowing full well that if I upgrade later, I could get 75% of the money back for em on ebay. Stock heads go for dirt.
But at the same time, you can pick em up(E7's) for nearly nothing.
This is true. If you can find a set where someone else already did all the work, they can be a reasonable deal. I doubt the OP has the equipment or knowledge to do his own porting.
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