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If you have larger valves installed and don't open up the pockets and bowls you just wasted your money. The stock pockets and bowls are too small for stock valves. 915 & 906 heads don't like 1.88 valves, they're too big for the ports and cause the flow to stall. They were used in max wedge heads because they had huge ports to compliment them. I've got ported 915 heads on our '72 Dart with 2.14/1.81 valves and it runs 10.38/ 130 mph, single four bbl.

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If you have larger valves installed and don't open up the pockets and bowls you just wasted your money. The stock pockets and bowls are too small for stock valves. 915 & 906 heads don't like 1.88 valves, they're too big for the ports and cause the flow to stall. They were used in max wedge heads because they had huge ports to compliment them. I've got ported 915 heads on our '72 Dart with 2.14/1.81 valves and it runs 10.38/ 130 mph, single four bbl.

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please stop clouding the issue with facts ....

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Sorry.

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There is a certain amount of porting that has to be done when you install larger valves , if you don't you will see no increase in performance .

What heads are currently on the engine ?

Also are you sure they are 1.88 ? I'm not sure there is enough room to get those 2 valves in that heads

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I did alot of work on the 516 heads I had. they were a 2.14/1.81 combo as well. I had to unshroud the exhaust valve a fair amount. I believe tha chambers are actually quite similar on the 915's With 1.88 you will probably have to look at doing that as well. May have to blend that out a bit more. You probably run out of chamber space for breathing if that is not done. Just my

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Who has the Mopar templates?

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There is a certain amount of porting that has to be done when you install larger valves , if you don't you will see no increase in performance .

What heads are currently on the engine ?

Also are you sure they are 1.88 ? I'm not sure there is enough room to get those 2 valves in that heads

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Totally positive,
A friend of mine had these heads done at HP PERFORMANCE here in Tomball, Tx. the tech that did the job told him that going with the larger exhaust valve would kill bottom end torque. I was a little skeptical so before i install them i wanted to ask first. I have stock 906 heads w/2.14 int & 1.81 exh valves and a Torker 2 w/850cfm Holley dp on a 1969 440-6 hp bottom end now. All original internals (6 pack forged crank & rods) except for the speedpro flat top pistons. Its no slouch by far but i am used to my high 8 second Falcon. It has been a while since i had a decent street car. The cam is an off the shelf Hyd Lunati and was told that lift was 604 int., this has not been confirmed. Definitely has a hefty lope and stops pulling around 6200 rpm. 4 speed w/ 3:91 sure-grip. I am looking for a solid 11:50 car that has good street manners. I did purchase a set of Snapon cutter bits to do a bowl blend and clean up the runners. Who has the Mopar templates?

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Other than a small bump in compression you probably won't see much of a gain with the 915's .

Same goes for the at least ONE other heads should you mention should you decide to run them OUT OF THE BOX from what little I have paid attention to.

The templates are for stock valve sizes , if you aren't really sure what you are doing trying to adapt them UP might make the heads flow WORSE than stock in the mid lifts , I have a pair of 906's that the local, well versed, machine shop I use did their COMPETITION VALVE JOB on , cost me 250 bucks , the heads flowed WORSE than untouched heads when they were done