YAMMIEGOD3:16
Active member
HAD A GUY ASK ME A QUESTION AT THE GRASS DRAGS OVER THE WEEKEND THAT STUMPED ME FOR A SECOND. GUY HAS A 98 SRX AND HE WANTED TO KNOW WHAT SIZE BASE GASKET UPDATES EXHAUST PORT ON 98 TO 2000 -01-02 SPEC. I HAVE TO SAY I TOLD HIM HE PROBLEY NEEDS A PORT JOB. I DID NOT RECALL A POOR MANS PORT JOB ON THE SRX 700 ENGINE. 3:16 (yammie tony)
valin
Active member
It will work. I know the port timing was lower in the '98-'99's, but I don't remember how much. I think I recall some guys just doubling up on the base gaskets, and cutting the heads 20 thou.
YAMMIEGOD3:16
Active member
THANKS RYAN. SIMILAR TO WHAT WE DO ON THE VMAX 4. 3:16 (yammie tony)
mopar1rules
Active member
tony, stock '98-'99 cylinders were 32.5mm from deck to port roof. '00-'02 cylinders were 31.4mm from the deck to port roof. take 32.5mm and subtract 31.4mm from that and you get 1.1mm. take 1.1mm and divide it by 25.4 and you get .043". each base gasket equals .010" thick, so you would need 4 extra gaskets on top of the original 1 that you need, so a total of 5 gaskets, seems to be it. he will need to then do something w/the heads of course.
his transfer durations might start to get a little high tho. deck height will go up the same .040" as well.
stock '00-'02 cylinders:
194* exh
130* main transfers
126* sec transfers
126* boost
32* blow down
stock '98-'99 cylinders:
190* exh
128.4* main transfers
123.7* sec transfers
123.7* boost
30.8* blow down
.010" (.254mm) raised--1 extra gasket
191* exh
129.5* main transfers
124.9* sec transfers
124.9* boost
30.75* blow down
.020" (.508mm) raised--2 extra gaskets
192* exh
130.7* main transfers
126* sec transfers
126* boost
30.65* blow down
.030" (.762mm) raised--3 extra gaskets
192.8* exh
131.9* main transfers
127.3* sec transfers
127.3* boost
30.45* blow down
.040" (1.016mm) raised--4 extra gaskets
193.8* exh
133* main transfers
128.5* sec transfers
128.5* boost
30.4* blow down
his transfer durations might start to get a little high tho. deck height will go up the same .040" as well.
stock '00-'02 cylinders:
194* exh
130* main transfers
126* sec transfers
126* boost
32* blow down
stock '98-'99 cylinders:
190* exh
128.4* main transfers
123.7* sec transfers
123.7* boost
30.8* blow down
.010" (.254mm) raised--1 extra gasket
191* exh
129.5* main transfers
124.9* sec transfers
124.9* boost
30.75* blow down
.020" (.508mm) raised--2 extra gaskets
192* exh
130.7* main transfers
126* sec transfers
126* boost
30.65* blow down
.030" (.762mm) raised--3 extra gaskets
192.8* exh
131.9* main transfers
127.3* sec transfers
127.3* boost
30.45* blow down
.040" (1.016mm) raised--4 extra gaskets
193.8* exh
133* main transfers
128.5* sec transfers
128.5* boost
30.4* blow down
Last edited:
blown down look a little low 
mopar1rules
Active member
i edited the specs. i was off on the raised specs. here ya go...new specs and you can compare for each gasket height change.
YAMMIEGOD3:16
Active member
JOSH, PERFECT. WHISH I HAD YA WITH ME WHEN GUY ASKED ME THAT QUESTION. lol. 3:16 (yammie tony)
mopar1rules
Active member
well tony, now you can print this off and give it to him.....LOL. now he can decide from the specs what he wants to do.
keep in mind it change all the timing
mopar1rules
Active member
modsrx said:
i know.....that's why i posted all the new durations of the ports, w/each .010" increase of base gasket. all the durations seem to increase pretty evenly and nice and gradual....IMO.
YAMMIEGOD3:16
Active member
GOOD INFO BUD , THANK YOU. 3:16 (yammie tony)