Bluetop Engine Rebuild multiple question Goal 150-160hp

[oldeskewltoy]

Be careful in your assumptions..... they test one of each heads... that is by no means definitive proof.... additionally it would have been nice to see 3 runs for each and then an average.

I've now had at least 15 4AG heads on my flowbench, and 16V heads pretty much flow similar numbers.... with that said, early (largeport) castings tend to be a bit better cast then later heads - this is true for smallports as well. Finally, a properly ported head will easily outflow either early, or later TVIS castings.

Some care should be used when discussing power ratings - engine power means very little in the real world, wheel horsepower is a far better tell. Wheel hp measured 1:1 (many 4th gears, but not all are 1:1)

Can you get to 150whp with a 4AGE, the answer is no problem, although the largeport intake manifold does become a challenge around 145-150whp. I'm making 145whp in my smallport* using Euro 10:1 pistons - but the head has been extensively worked - chambers now down to about 33cc, so compression is closer to 10.7:1 (* - smallport head and block, with a 40mm crank, rods, and 10:1 pistons) I'm using a mild cam Web camshafts 577 grind - equivalent to a 264 type, using 8.38mm lift. I've kept the smallport intake manifold (single T/B)

I've built a number of other 4AG heads, and engines as well - https://gallery.ostportworks.com/index.php



So....

My questions are
1. Are the above stats correct? Pretty much
2. It seems that i can reach my power goals with the bluetop engine
Or it wise to change to smallport? - if retaining stock manifold easier with a smallport - properly set ITBs will flow what is needed for either head
3. I also want to change oil pump, water pump etc. I read that the 20V oilpump fits on any 4 AGE. Did anybody installed a 20V oil pump?Silvertop pump, and smallport 16V use the same pumps(19036) - don't use Blacktop, different timing tensioner
4. I also read on the garage 4AGE channel that there are different bigport head versions. Is that true? essentially no, although it is easier to find a "nice" early casting
5. Can anyone recommend a piston sets? Get a set of pistons made - flaw in all stock 16V pistons - poor 2nd ring land support
6. What is the max compression for a standard ECU? I read that 10,7-10,8:1 is possible with the standard ECU. stock ECU can handle 10.7:1 - with a worked head - bigger problems tend to come from big cams and a stock ECU
7. Do i need aftermarket ECU for ITBs? Pretty much