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Tim, Post #29. Do you mean that adding the nozzle increases flow? If so, that is incorrect.

If it has 0.380+" lobe lift, then the lobes are already going to be small & unlikely suitable for re-grinding. What engine/car specs/usage? More info so a cam suggestion can be given.

215 lbs according to the Atherton book.

That's great! I think many people are suffering unnecessarily with a rough idle because their plugs are too cold.

Mattax, I have had no interaction with 'harrisonm' in this thread or any other thread that I can think of. In post #96 he chose a personal attack on me. That is fine, I am a big boy. But when you do that, expect a return serve......which is what I did. What post #96 showed is his lack of...

Booster or booster related; check booster hose, not blocked, or collapsing under vacuum; booster check valve.

There is a LOT that contributes to rad efficiency. Copper tube rads are limited to tubes about 1/2" long because of copper's poor strength. Alum tubes are often 1 or 1.25" long. The extra length allows for much more fin area. Even though alum is not as good as radiating heat as copper, the great...

The cam grinder assumes the rockers will transmit the correct ratio to the valve. So if the cam is sold as having 0.450" valve lift, with 1.5 rockers, the lobe lift will be 0.300" if the cam has been accurately ground. Is the cam new or used? If used, & lobe peaks are worn, it will be hard to...

Sounds like you have the Bettes book, a great book. I find that a lot of assumptions are made with some of the calculations, resulting in wrong final numbers. D. Vizard also has an excellent porting book, SA 215. He claims the common 28" used is a compromise.

With your current intake, you have 7 cyls that can interfere [ they are cross-connected ] with the cyl that is drawing air. With a dual plane, much less interference, only 3 can interfere. I have no experience with your type of EFI, but it maybe a factor to look at.

Is the idle smoother with the hotter plug?

Harrison, Your ignorance is showing. There is no 'explosion' in a properly designed IC engine. The mixture burns at at a controlled rate...

Don't forget than that when you increase pump speed, you also increase fan speed to help pull more through the rad.

Turk, Go back to sleep. You missed 'In general' on p.8.

OK, Back to the topic. I should have been more specific. Waaaaaay back in another thread, 273 claimed that a bigger piston made more hp because of the increased area. The extra area created more 'push'. Not on it's own. There is a sequence of events that occur to make this happen. The...

Roger Huntington made a very good point in his American Supercars book. Ferd built the 429 Shotgun engine with huge intake ports to beat the 426 Hemi. Only 'half' worked..... Ferds were quicker on long tracks, Hemi was quicker on short tracks...

Do you know the specs for the thermostat OD? Maybe the stat is the culprit?

Here is the pic that should have gone with post #48.

Here is refresher about force v pressure. Same force was applied to each coin, but the end-on coin penetrated further because it more force per area. Two pistons 4" & 5" diam, 1000 lbs in the chamber. Both pistons have 1000lbs of force applied. The 4" piston has a pressure loading of 79.6 lb/ sq...

273, You can carry on with all the BS you want. The fact is that piston area is on the bottom line of the formula, & when the bottom line gets bigger, the answer [ power ] gets smaller. Until you stop confusing force with pressure loading, you will never get it....

OK, I apologise for using the word dummies. This 'discussion' started because 273 claimed that more piston area gave more hp by virtue of the piston area increase. It only does this IF more air is drawn into the cyl; if no more air was drawn into the cyl, then the HP would not change, all else...

I think there a few here that get it, but not the dummies '273' & Turk. I will post the info AGAIN from Harold Bettes, who does get it. [ Turk read the text, don't look at the pretty pictures ] What does Bettes get? He gets that if you increase piston area, the pressure loading over area [...

I understand how it works [ you do not ] & I don't need your [ wrong ] advice....& nobody else needs it either.

Good to hear!!!

Well, RRR, the beer is always flowing for ya.....bring ya summer weather with ya.... I just do not like bullshit. I have made lots of errors, some on this forum, & have owned them when they are pointed out. I get the impression from Shorty's posts that he is trying to learn.....& listen to new...

What cam specs? If not using one, use a high flow 180 thermostat. At least remove & test the existing stat. It may not be opening fully. Do not drill holes in the stat; all it does is increase warm up time. Main problem is pump speed [ & therefore fan ] too slow; makes a BIG difference. Pump...

Shorty said in post #1 he was looking for suggestions. I am giving him suggestions on how to avoid making mistakes, by avoiding the advice of certain people......who are giving him WRONG INFORMATION.

And what about distribution? Of air & fuel? Many production engines had snivvies riveted to the side of the booster to re-direct airflow. Obviously the factories found variations in cyl-to-cyl air flow & this was a fix that was used. Aftermarket carbs.........Well who knows. Some of the...

Pretty sure the Poly 318 cam is different to the 67 & later 318. Different lifter bore angle. Isky lists different part numbers for the two engine series.

Shorty, I apologise for interrupting your thread but you & the readers are being fed absolute bullshit by '273'' & Newbomb Turk with their claim that increasing area of the piston creates more push on the con rod. They know it is wrong but haven't got the guts to admit it. They are getting...